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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28283 results found.

  1. GRB 130327B: Swift/XRT source is not the afterglow
  2. Trigger 553930: Swift detection of a possible flare from HR 5110
  3. GRB 130418A: LOAO Observation
  4. GRB 130418A, Swift-BAT refined analysis
  5. GRB 130418A: REM NIR observations
  6. GRB 130418A: RATIR Optical and NIR Observations
  7. GRB 130418A: GROND detection of the optical-NIR afterglow
  8. GRB130418A: OSN 1.5m fading afterglow detection
  9. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  10. GRB 130418A: Enhanced Swift-XRT position
  11. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  12. GRB 130418A: TNG optical observations
  13. GRB 130418A: Bassano Bresciano Observatory optical observations
  14. GRB 130418A: 1.23m I-band observations
  15. GRB 130418A: Swift detection of a burst with an optical counterpart
  16. GRB 130408A: Suzaku WAM observation of the prompt emission
  17. GRB 130408a: Skynet Optical Observations
  18. GRB 130408A: SMARTS optical/IR afterglow observations
  19. GRB 130408A, Swift-BAT refined analysis
  20. GRB 130408A: Zadko observatory - Gingin optical observations
  21. GRB130408A: Swift/UVOT followup observations
  22. GRB 130408A: Swift-XRT refined Analysis
  23. GRB 130408A: Enhanced Swift-XRT position
  24. GRB 130408A - Gemini-S/GMOS redshift determination
  25. GRB 130408A - VLT/X-shooter redshift determination
  26. GRB 130408A: GROND detection of the afterglow
  27. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  28. GRB 130408A: Swift detection of a burst
  29. GRB 130211A: Retraction of afterglow candidate
  30. GRB 130327B: Suzaku WAM observation of the prompt emission
  31. Konus-Wind observation of GRB 130320B
  32. Swift detection of IGR J18245-2452
  33. IPN Triangulation of GRB 130320B (very long/bright)
  34. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  35. GRB 130306A: Confirmation of the X-ray Afterglow
  36. GRB 130310A: RATIR Observations
  37. Swift Trigger 552142 is a noise event
  38. GRB 130327B: Fermi GBM detection
  39. Swift Trigger 552142: a possible GRB
  40. GRB 130327B: gamma-ray detection by AGILE
  41. GRB 130327A: Swift-BAT refined analysis
  42. GRB 130327A: Gemini Observations
  43. GRB 130327A: Swift-XRT refined Analysis
  44. GRB 130327A: Weihai optical obsevations
  45. GRB 130327A: Swift/UVOT Upper Limits
  46. GRB 130327A: ISON-NM optical upper limit
  47. GRB 130327A: Enhanced Swift-XRT position
  48. GRB 130327A: RATIR Optical and NIR Observations
  49. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  50. GRB 130325A: Fermi LAT detection
  51. GRB 130327A: Swift detection of a burst
  52. report: GRB 130315A: Zadko observatory - Gingin optical observations
  53. GRB 130325A: Fermi GBM detection
  54. GRB 130305A: Gemini follow-up observations
  55. GRB 130315A: GROND afterglow candidate
  56. GRB 130315A: Swift/UVOT Upper Limits
  57. GRB 130313A: optical upper limit in CrAO
  58. GRB 130313A: optical upper limit in Mondy observatory
  59. GRB 130315A: SALT optical observations
  60. GRB130313A: GTC early optical limits
  61. GRB 130313A: 5.8 GHz VLA upper limit
  62. GRB 130315A: Swift-XRT refined Analysis
  63. Swift XRT observations of GRB 130310A
  64. GRB 130315A, Swift-BAT refined analysis
  65. GRB 130313A: Swift/UVOT Upper Limits
  66. GRB130315A BOOTES-3 optical limit
  67. GRB 130315A: Swift detection of a burst
  68. GRB 130310A : Suzaku WAM observation of the prompt emission
  69. GRB 130305A: TLS Tautenburg observations
  70. GRB 130313A: RATIR Optical and NIR Observations
  71. GRB 130313A: TNG optical observations
  72. GRB 130313A: Fading X-ray Afterglow
  73. GRB130313A: Optical observations from GTC
  74. GRB 130313A: NOT optical upper limit
  75. GRB 130313A: Swift-XRT refined Analysis
  76. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  77. GRB 130313A: Weihai optical upper limit
  78. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  79. GRB 130313A: Swift-BAT refined analysis
  80. GRB 130313A: Zadko observatory - Gingin optical observations
  81. GRB 130313A: MASTER-Net optical observations
  82. GRB 130313A: Swift detection of a short burst
  83. IPN Triangulation of GRB 130307A
  84. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  85. GRB 130310A: optical observations
  86. GRB 130306A: Swift Detection of a Possible Afterglow
  87. GRB 130131B: host detection and redshift
  88. GRB 130310A: Fermi-LAT detection and localization
  89. GRB 130306A: MITSuME Ishigakijima upper limits
  90. GRB 130306A: Swift-BAT refined analysis
  91. GRB 130305A BAT refined circular
  92. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  93. GRB 130305A: Gemini-North upper limit
  94. GRB 130307A: Fermi GBM detection
  95. GRB 130305A: Swift/UVOT Upper Limit
  96. GRB 130305A: RATIR Observations
  97. GRB 100615A: HST host detection and X-shooter redshift
  98. GRB 130305A: Swift/XRT detection of the afterglow
  99. GRB 130305A: Fermi GBM observation
  100. GRB 130305A: Fermi LAT Detection

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